Choose the exact meaning of the idiom/phrase. Black sheep

A disreputable member of a group is the exact idiom/phrase.
A costly item - is a wrong answer because the definition of a costly item is "extremely expensive or high price," which is not the same as the definition of black sheep.
A dark, shiny object - is an incorrect answer because the definition of a dark, shiny object is 'Something that is widely appealing or attention-grabbing for its superficial characteristics, but which is usually not useful, substantial, or long lasting,' and this is not a synonym for black sheep.
The right answer is a disreputable member of a group, because the definition of a disreputable member of a group is "the least reputable member of a group; a disgrace." For example, "Uncle Fritz was the family's black sheep," which is a synonym for "black sheep,".
A funny man - is an incorrect answer because the definition of a funny man is "professional clown or comedian," which is not the same as the definition of black sheep.